Wire-stripping machine



July 23, l929 G. H. HARTMAN WIRE STRIPPING MACHINE Filed March 19', 19255 Sheets-Sheet l IVM @M mf. W

[Awww lNvENTUR Ilm July 23, 1929. GH. HARTMAN WIRE STRIPPING MACHINEFiled March 19, 19025 3 Sheets-Sheet 2 INVENTDR July y23, 1929. y

cs.l H. HARTMAN WIRE STRIPPING MACHINE Fi M ied March 19, 1925 3Sheets-Sheet 3 j INVENTUR .TNI

GEORGE H. HARTMAN, or CLEVELAND, oHro.

WmE-s'rnurme MACHINE.'

Application filed Maron 19, 1925. serial No. 16,602.'y

This invention relates `to wire strippingy machine to strip theinsulation from the ends of insulated electric wire.

An object of the invention is to provide ar simple compact machine foruse Where nungbers of ends of wire have to be stripped and a machinethat will do this in a better and faster manner than is now stripping.

Another object of the invention is to provide in a machine of thisclass, a machine that will twist the strands of strandedwire togetherduring the operation of stripping, thereby making the stripped end readyfor the fastening of the terminal connection.

Another object of the invention is to provide a machine that during thestripping operation will polish the stripped end of the wire free ofdirt and other foreign matter so that the terminal connection may be themore easily soldered thereon.`

Another object of the invention is to provide adjustments thatcwillpermit a single machine to strip wire of'vary'ing diameter.

Another object of the invention is to provide adjustments which willpermit of many sharpenings of the cutting knives, used to cut theinsulation, Without destroying the setting of the knives, in theirrelation to the wire during a stripping operation.

Further objects and advantages of the invention are apparent from thefollowing detailed description.

While the invention in its broader aspect is capable of embodimentv indifferent forms' a preferred embodiment thereof, and of the mechanismforming the same are illustrated in the accompanying drawings, in whichFigure 1 is a cross sectional elevation of the machine. r Y `Figure 2 isa front end View, to reduced scale. f f Figure 3 is a cross sectiontaken along the line 3-3 in Figure 1, to reduced scale.'

Figure 4 is an elevation of the operating side lof the machine with thefoot operating means shown thereon.

Figure 5 is a cross section taken along the line 5 5 in Figure 1. f

Referring to thedrawings, 1 (Fig. 1) designates a cast case to hold theoperating portions vof the machine, and -into which they are mounted.Mounted in bearings 3 and 4- of the Case 1 is a shaft 2, this shaftbeing guided for rotary movement therein and receiving rotation as shownin the present possible by hand instance, from a'pulley 5, mountedon'ithe'f l PATENT10Fr1c11.-

outer end of the shaft 'and-externalofthel'i ing this 'shaft 2 could beusedffo'r instancel an electric motor. The case'2 is divided into twomam sections the Iportion nearest the case. Itis evident that othermeansfoffdriw" j pulley 5 beingsealed for'the retentionbfy lubricant,and the other section being cutf .away part to provide a passage v'forthe waste-insulation (Fig. 5)Vas is hereafter I ,A

completely disclosed. 'i

Mounted on they end of the'shaft the pulley end and fixed therewith forrotation, is a yyolred member 6. (Fig. 15) n Two pivot bosses 7 'areprovided'in this yoke@V member and mounted therein arebell` cranks 7^ 'l8. Fixed at the outer outwardly extendingv end of each bell'crank 'isav'cuttingflinife"91jl Extending upwardly from the extendingarin of thebell crank and mounted into a 'cupp'ed portion-thereof is a coil spring10..'This coilv spring bears against anextending portion'o'fv the'yoliedmember 6, andl the 'spring of 'each vbell crank serves to pressitsrespective knife 9 into the center linevr of the machine. j' f" The@mi of the Shaft A2, which cames the poked member 6 isdrilled,'inftowhich` drilled@ olevis inserted a 'shaft 11. AThisshaftgll isf guided for endwise reciprocatory movement in the shaft 2.At 'the-'rear end of the shaft 11'* isa pin 12.' This pin12- passes thruthe shaft" 11, and extends out thru the-slotsilin'feach side of theshaft 2,into and thru the 'collar 14gy f This collar 14 is mountedon theshaft 2:,forg` sliding reciprocatory movement therewitlrjy Co-actin'gwith the collar 14 is a thrustjb'earing" 15, mounted over the shaft 2and havingslidr ing reciprocatorymovement therewitha i Jour`v naled `inbearings at each side of thecase f1, is a'Yshaft-l, carryingat itscentral portion,

and internal of the "case 1, a tWo armed lever-f` 17, the outer endof'each arm of this-,lever being in contactal relation tothe thrustbear@v ing 15. The shaft 16` `extends to one'isideof the rod18 isconnect'e'd'to the foot "lever 19,-'

ner on thefloorand `is pivoted vin'asuitableff l bracket 20. AThe leverarms 171and121 are fixed by pins or keys to the shaft 1.6, so that 19,the lever arm 17 will be pressed against" upon a downward movementof thefoot leverl the thrust bearing 15, causing same to slide' on the2,',rearwardlyof the? machine' front against thecollarrlll,thereby"impartingV a longitudinal travel to the pin 12,.in.the. slots13, with a corresponding longitudinal movement of the shaft 11; Itisevidentxthatf a releasing of the pressure on the, footlever. 19 willbring a reverse of this movement of the lever arm 17, andtocounterbalance the..

weight of the foot lever andthe rod 181 have providediii-the,presentvinstancefa-coil spring` 22, mounted.. between a, projeet-ing,-V ledge eXT- tendingmutwardly, from the .side ofqthe baseV4,11,and?albossjon @the lower side ofthe lever-,21, ,K (Eigg 4,),y To.,limitethe upwardrmovement of:

theeleverA 21,1 have provided-a stop screw 23,- carried ina-boss-.QAextendingoutwardly from the side` ofi: the case 1iV The further purposeAr`.030ithisserew,23 is as hereinafter eX-jgilained.

The frontendloi the shaft 1-1 is threaded Vandcarri'es on thisthreaded-portion aiblock 25, anda collar 26. Mounted in eachr arm 8A 0Lthe ,belli4 crank-:8 which arms-8, eacheX- `vtendtowardthe `shaft-115and are-disposed'on:

opposite m'des-thereofzis-.a screw 2.7-, (Figv) and, 1,) Itisevident=tliat.upon;a-move-- mentiotthe shaftll toward the machinefront tlatthe block-25 .-willipress against the screws` 27. with-the,resultthatthe zbellcranks 8 will" be; rotated aboutl their respectivepivots, .and

the..fonwardlyyextendingiarms 8 of the-bell.- j

cranks-:willbefmovedoutwardly, awayfrom? the shaft .121iv Ittiss-evidentthatg-duringfthisi l l movement-{thatf the;- coilsprings- 10 willl becompressed; and that upon a; reverse g move'- ment ofttheshaf-txll,these-coil.springswlOfwill return, the ,ferwardly-l extending-5 arms ofthey bell cranks' ytma-position towards-the center;

, line-loli-` the machinef andthat. this returning -y movement.. of? the.coil springsfy will cause-A the 17s, Itisrnowevidentthata.pressingdown-ot'.V

- adjustment can-tbe` effected-during; stripping j screws 274 to,-pressf. against; the -block- 25 and; j

this in--`- turn.- cause the thrust bearing 15X- to` move towards andcofact*l with the lever; arm:

Vthe'xfootlever; 19,-wilL open-the cutting knives; Q-/andithaha--releasing-ofthe yfoot lever, ,per-- mitting 3 it? to return to its;origina-l: position f vwill ,bringgtheknilles-together. It is also evildent., thatt the-- amount,- ofi distance. thatI the knivessare permittedto-oome-together-:isfregu--- lated-thy, anJadjustmentof'tliej-serew- 23lwhich operation of-:the machine.

riediomthe fcaseby means ofthree -.serews-29.. Itmis evidentl that by,means t of adjustmentsprovided hyt'hese' screws .29, ,that thecenter. fl othei-coverf plate-teau beshif-tedatwill Ito-Acoineide with@thecenterline-,0i the-case 1 ,gandthatibyreason of-.thisadj ustment.rough -cast-.f ings may-be. used.I` In the-center ofrthe-,jplatetV 28ise:ii-tappedhole-f into which t issereweda:- pilotLbushing-. This-bushing;30u-is :drilled: withv ,ashole-ofsuitable-size for, the wire ythat 1isftu-eestrinned-a Screwed into the frontendjxof the-collar: 2.6; n

is a gauge pin 33, against,which-Lthe;wire-- to-be stripped is fed,-into. The, screwing in or. out-,as-the case-may be ofXthis-piny 2.6deter-- mines Lthe amountoflw-ire-that is exposedfto j the strippingaction of the knives 9: A-cover 34 is-mountedlover the-rearendofthe-case 1,.

disposed internal 0f.- thissportionofthe case.

This-cover is-fastened tothe caseA by, screws-- t orinanyothersuitable-manner. Oill cups I35are..provided for:4 eachof-thebearings in` The; front-por# which the-shat-2 isi-revolved. tionof: the case 1- iscut yaway to-provideanz outlet for the. wastelstripping and-the machine l-vto keep out dirt and to retain thelubricant; j

is mounted asf-shown int-Fig,- .1-, so-thatzthis cut v out portion t ofYtheV case extends over the. edge?` oi the: bench-36,., the wastestripping therebybeing.V permitted t0 fall; onto the floor..

The operation of themachine i s-asfollows;`

The. adj ust-ing. serewss23;` and 27 i are. setse that the cutting;knives 9;- a-reopened; the' exactainount required? fori the si-Ze of.wire to be;

stripped, andalso so thatf eachg edge-Oeach knife is the same distance-from-,thecenter' line ofthe machine., Powereisfthen applied -to ,the yA machine andithecshaft2, and the parts-carriedi thereon, are-ceausedatorotate at :ehiglgi:speecha The foot lever is1then-.-pressed,fopeningthe'knivesand the` endoi the-wire .t0-be stripped isinserted .thru thebushing 30,and npr-against.

the gauge pin 33. The pressure-,is-now re moved t from xthe foot lever-19...-and the knives permittedto 'closeVv in around: the `-wire. TheAsettingL of. the.- adjustment. serewsiy has-v beeny made so thatthelniives--iniclosing:A in cut intothe insulation but-inet; into the.wires. .The wire is nowpulled romlthe machine,against the rotatingcutting knives 9.v This-action. causes` the 4insulation toybe-l cutVandk stripped away from the wire, and in the case of. stranded@ wire:the rotation` of the cutting knives producesa twisting movementjto fthe'j stripped end of `the ,wiref and( the. strands are twisted.intoonetightstrand,.-I V It.-- isealso-v evident that theadjustment-screw-23'can be soy regulated. that .the knives close in. on.the

Y, wire enough to permit the yknives-to polish' the wire .free ofdirt--andf-oxi'des- It isf-also evident that the adjustment iscrews-27fper-mit one knife tobez sharpened and,r ground.I away independent of`the 1 other, knife, ais-with. thisr adj ustment-'each'knife can be`regulated `in-:itsa

setting inrelationftoy the center line of.- the.

v machine, independent-of-therotheimknife.,V It,

is also evident that for correct operation of the machine the knivesmust at all times revolve on the center line of the machine and thecenter line of the bushing 30.

I wish it understood that the particular form of mechanism with which Ihave clothed my invention, and the different parts thereof illustratedand described, are merely typical means of carrying my invention intoeEect, and that the specific construction described herein is merely byway of illustration and not by limitation or narrowing of my claims, asobviously, changes in construction and design can be made withoutdeparting from my invention, and such changes are contemplated by me,and would not involve any departure from my invention.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent, is:

1. In a machine of the class described, a retaining case, a revolvingmember therein, means to revolve the revolving member, a pair of knivesmounted on the revolving member,

l means to open and close the knives, a front cover plate for theretaining case adapted to receive bushings for guiding the wire, andmeans to adjustably connect the cover plate to the case to bring thebushing central with respect to the pair of knives.

- 2. In a wire stripping machine, a rotatable member, a sliding shafthaving an abutment, a pair of spring tensioned bell cranks pivoted tothe member and having wire strippers on one of their arms, the otherarms of the bell cranks extending on opposite sides of the shaft, meanscarried by the last named ends of the bell cranks and engageable withthe abutment so as to be operated thereby to move the strippers awayfrom one another, and means toslide the shaft.

3. In a wire stripping machine, a rotatable member, a sliding shafthaving an abutment, a pair of spring tensioned bell cranks pivoted tothe member and having Wire strippers on one of their arms, the otherarms of the bell cranks extending on opposite sides of the shaft, meanscarried b the last named ends of the bell cranks an abutment so as to beoperated thereby to move the strippers away from one another, and meansto slide the shaft including a spring tensioned depressable lever, meansto depress the lever, and adjustable means to limit upward movement ofthe lever to restrict sliding movement ofthe abutment and therebyclosing movement of each of the strippers.

In testimony whereof I affix myl signature.

GEORGE H. HARTMAN.

engageable with the v

